No, I don't think this is a GMAT-like question.
As for D, it's perfectly all right not to specify whose interest we're dealing with. It's important not to think of A as the "original," because then we start thinking we can't change the meaning presented in A. This is an absolutely false assumption. As long as the answer choice presents a clear and sensible meaning, it's fine.
Note that even if we said "man's interest," it wouldn't be much more specific. Clearly, humans are
...
As for D, it's perfectly all right not to specify whose interest we're dealing with. It's important not to think of A as the "original," because then we start thinking we can't change the meaning presented in A. This is an absolutely false assumption. As long as the answer choice presents a clear and sensible meaning, it's fine.
Note that even if we said "man's interest," it wouldn't be much more specific. Clearly, humans are
...
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